4
Fig 1
Selecting a Location
This furnace shall be centrally located in relation to the outlet registers. All ductwork shall be suitably sized with external static
pressure in mind to ensure satisfactory air distribution.
These furnaces are suited to vertical upflow, downflow and horizontal installations. This furnace shall not be installed on its front or
back. To install this unit on its front or back would result in inadequate access for servicing.
Always ensure that when suspending this furnace that suitable structural support is available and provides adequate access to the
control and fan compartments for service.
Clearances to Combustible Materials
The Furnace
- The furnace is approved for zero clearance to combustible materials regardless of the heating capacity.
It is recommended that 24” be provided at the front of the furnace for clear access for servicing.
Supply Air Ducts
- Supply ducts for furnaces with a heating capacity up to and including 20kW may be installed with zero
clearance to combustibles.
Heating ducts for furnaces with heating capacities of 23Kw and greater must have a 25MM (1”) clearance to combustibles for
the first .90m (36”) of duct. Thereafter the clearance can be zero.
Duct Connections
Of utmost importance to ensure the satisfactory performance of this furnace is the ductwork. To reduce the transmission of noise
and vibration it is recommended to use non-flammable flexible isolation collars. Correct duct sizing and installation methods will
ensure proper airflow providing comfortable balanced delivered air.
All duct work should be designed, fabricated and installed in accordance with all national and/or local codes.
Air Filters.
Included with this furnace is a 20” x 20” x 1” disposable air filter and supporting filter rack. This filter rack shall be secured to the
furnace casing on either side or the bottom. Do not install this filter rack on the front or back of the furnace. Doing so will result
in inadequate air flows. When cutting the return air opening in the furnace, use the square knockouts in the side and bottom panels
as reference. This will provide a free area opening of 18” x 18”. The use of pleated filters is not recommended unless sized to
suit the airflow requirements of the installation. Pleated air filters tend to increase total system static pressures. This may result in
reduced airflow. As a result, the heating elements may operate at increased temperatures resulting in an overheat situation. Airflow
reductions may also occur during cooling cycles resulting in unacceptably low delivered air temperatures.
NOTE: Return air opening must be
cut out to knockouts provided.
Minimum return air opening size,
18” X 18”.
Caution: Return air openings shall not
be installed in back panel.
Supply air plenum must be constructed of
suitable materials and sized by installing
contractor so as to be of sufficient strength to
support furnace and accessory fittings
and materials.
Return air knock out
NOTE: Field selected suspension materials
must be sized by the installing contractor
and be of sufficient strength to support
air handler weight of 100 lbs and connected
accessory fittings and materials.
Minimum 1” x 1” x 1/8” angle
Horizontal Installation
Upflow Installation
Counterflow Installation
